I don’t doubt the wisdom of the development plans for Paperpile mobile, but since it seems like it will be a while before we have a “save to Paperpile” button on mobile devices, I’m curious how other people manage this?
Up till now my method of choice has been to use Todoist, but I recently discovered an iOS app called GoScholar (there is also a free ad-supported version called Research Paper). This can be linked with your Google Scholar “my library” page. The advantage of this method over Todoist is that the Paperpile plugin works on the My Library page, allowing you to quickly add the references as you scroll through the list.